linux-kernel - Re: [PATCH next/mmotm] slab: fix DEBUG

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Date:	Tue, 12 Jul 2011 14:00:03 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH next/mmotm] slab: fix DEBUG_SLAB build

On Tue, 12 Jul 2011, Christoph Lameter wrote:
> On Mon, 11 Jul 2011, Hugh Dickins wrote:
> 
> > -#if ARCH_SLAB_MINALIGN
> > -	if ((u32)objp & (ARCH_SLAB_MINALIGN-1)) {
> > +	if ((unsigned long)objp & (ARCH_SLAB_MINALIGN-1)) {
> >  		printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n",
> 
> Change %d to %ul for consistencies sake and drop the cast of
> ARCH_SLAB_MINALIGN?

I don't think we can drop the cast of ARCH_SLAB_MINALIGN, or not without
a wander through all the architectures: it could well be defined as a bare
integer in some of them, even if the default definition as __alignof__
comes out as an unsigned long (which itself surprised me).

I could make it an unsigned long cast, and change the %d to %lu,
but there doesn't seem to be any real point to doing so.

Hugh
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